Redox reactions play a pivotal role in chemistry and biology. The values of standard…
Chemistry · JEE Advanced · NTA Exams — Some Basic Concepts in Chemistry
Redox reactions play a pivotal role in chemistry and biology. The values of standard redox potential (E°) of two half-cell reactions decide which way the reaction is expected to proceed. A simple example is a Daniell cell in which zinc goes into solution and copper gets deposited. Given below are a set of half-cell reactions (acidic medium) along with their E° (V with respect to normal hydrogen electrode) values. Using this data obtain the correct explanations to questions 163 to 164
I2 + 2e–
Cl2 + 2e–
Mn3+ + e–
Fe3+ + e–
O2 + 4H+ + 4e–
- O2 oxidises Mn2+ to Mn3+
- O2 oxidises both Mn2+ to Mn3+ and Fe2+ to Fe3+
- Fe3+ oxidises H2O to O2
- Mn3+ oxidises H2O to O2.
Answer
(D) Mn 3+ oxidises H 2 O to O 2 .
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